Material and Methods Between June and December of 2008 we evaluated 90 egg donors. They underwent COH with 150 IU rFSH as starting dose, we separated them in 3 groups (n:30 each): Groups 1 and 2 received a 0.25mg daily dose of GnRH antagonist when a follicle 14mm in diameter was observed. hCG 250g was given to group 1 while group 2 received triptorelin 0.2mg when leading two follicles were 17mm. Group 3 was stimulated with standard long protocol, hCG was given following similar criteria.